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29.What did Paul Tulane do inA.He ranked universities.B.He established an institute.are童ameCHe gave charity to educatioD.He changed the name for a university.BHistoricalD.Public.What udFtdvoteto theaA.Respected.C.Informal.A.The traditional mode.BThe integration of subC.Strengthening disciplinary action.D.Solving easy problems across disciplines.Astronomers long thought that an odd star system observed by the European SpacDAgency's Gaia satellite was a simple case of a star orbiting a black hole.But two astronomersarechallenging tht cm finding that the evideceevebeforese type of star mde of invisible dark mtter Theyand its mysterious dark companion,which is much more massive.What could that dark companion be?Maybe,as suggested.its a clump()of darkmatter.Dark matter is an invisible form of matter that makes up the vast majority of the massof every single galaxy ()We still don't have a solid understanding of its identity.Mosttheoretical models assume that dark matter is smoothly distributed in each galaxy,but thereare models that allow it to come together on itself.One of these models supposes that dark matter in this case is a new kind of boson()These bosons would have the ability to form clumps.Some of them oud be the sizeofentire star systems.but some could be much smaler.The smallest cou besallsand they getanw me:boson stars.Boso stars would betreynisbBecada dohieodetect themothe gravitational influence on their surrounding The researchers ontedsmodel of boson dark matter could produce enough boson stars to make the two astronomerfinding reasonable.While tunlikely that s the disovryfbfollow-uobervations are st urged.Mostpry,thise system gives usre【高三英语第1页（共12页】·24-30